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Here's a close-up picture of a piston and shim set. As you can see, the piston has holes in it. As the shaft and piston move up and down in the damper tube, the oil must pass through the holes in the piston. The shims are placed underneath and above the pistons to fine-tune how easily the oil can pass through the whole piston/shim assembly. The shims limit how much fluid reaches the holes in the piston to further control damping. By adding shims of different sizes and shapes, the damper can be tuned to react differently under different conditions. View Related Article
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